@MissOct2013: your prenatal will most likely contain B vitamins and iron. The most important one us folic acid. Folic acid is key for proper brain and spinal cord development and should be taken before you become pregnant, since a lot of that development takes place before you know you’re pregnant. Some people take mucinex to thin their cervical mucous and help the sperm make it through the cervix, it’s not really necessary if you have fertile mucous.